DECAPOD CRUSTACEANS OF THE WEST INDIES 



91 



Antennule with mesial margin of peduncle and inner flagellum 

 dark bluish purple; antennal scale with longitudinal dark line sepa- 

 rating lameUa from outer heavy portion. First and second pereiopods 

 translucent with corneous tipped fingers. Coxa, basis, and proximal 



Figure 20. — Macrobrachium acanthurus: a, male (carapace length 16.5 mm) from Dominica 

 station 14; b, male (cl 33.6 mm) from Dominica station 108. 



portion of ischium of third and fifth pereiopods with dark pigment. 

 Gnathal podomeres so pigmented that in ventral aspect two dark 

 lines converge from first oblique stripes on carapace across epistome 

 to bases of antennules. 



Larger shrimp with most elements of color pattern described above 

 present but subdued by additional coloration. Carapace reddish 



317-180—69 8 



